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They will awake when the time is right.

When the skies have turned black.
When the seas have turned red.
When Draigo is defeated in a Matt Ward wrriten Codex

The end time.
The Apocalypse.

or

GW is saving them for when they go broke and will trot them out as an all NEW SPACE CHAPTER!!!!!!!!!
With a new codex, special rules, new models, new fluff, and even a Black Library book deal. (This will of course be done before Sisters of Battle get any type of update)